Improvement in apparatus for recovering alkali from waste solutions



NI XON. 1 Apparatus fa-r Recovering Alkali from Waste Solutions,

No 198,671. Pat ented Dem 25,1877

00000 9000000 o f oo 0000 0300000 000000 lhvqnfirr N- PETERS, FHOTO-LITIJIOGRAPHER, WASHINGTON. D. C.

UNITED STATES PATENT QFFIGNE.

MARTIN NIXON, OF PHILADELPHIA, PENNSYLVANIA.

- IMPROVEMENT IN APPARATUS FOR RECOVERING ALKALIVFROM WASTE SOLUTIONS.

I Specification forming part of Letters Patent No. 198,671, dated December 25, 1877 application filed September 8, 1877.

lowing is a specification:

The object of my invention is to facilitate the concentration of alkaline solutions resulting from the treatment of paper-stock and similar manufactures, by subjecting the solutions to heat, in the manner described hereinafter, prior to their introduction into the evaporating and concentrating reservoirs.

In the accompanying drawings, Figure 1 is a vertical section; Fig. 2, a plan "view of apparatus wherewith to carry my invention into effect, and Fig. 3 a detached plan view of part of the apparatus.

A is a structure of brick-work, suitably strengthened by iron plates or, the structure containing the combustion-chamber B, of which D is the outlet, and the fire-place E, of which I) is the doorway, and d the bridge.

The heater consists of a series of inclined tubes, e, secured at each end to a disk or plate, f, and to each plate is secured acover, F, preferably of the concavo-convex form shown in the drawing.

From each cover projects ahollow trunnion, G, the trunnions of both covers bearing on anti-friction rollers h, carried by brackets g, secured to the structure A.

The end of an inlet-pipe, H, fits snugly in the hollow trunnion of the lower cover F, and

the outlet-pipe H fits in the trunnion of the upper cover, each trunnion having a stufiingbox for preventing leakage as the heater revolves, the inlet and outlet pipes being fixed.

For the purpose of reducing friction, I prefer to let the lower cover of the heater bear against two anti-friction rollers, z, carried by the lower bracket When the apparatus is in operation afire is constantly maintained on the grate of the fireplace, the heater is caused to revolve slowly, and a continuous stream of the alkaline solution is forced through the pipe H to the space within the lower cover F, whence the solution is forced through the series of tubes into the chamber within the upper cover,'and thence through the pipe H to the concentrator.

As the solution passes through the heater in asmany subdivided streams as there are tubes, it must be exposed to such an extended heating-surface that the desired effect must be rapidly attained, the quick and effectiyeheating of the solution being enhanced by the rotation of the heater, since the position of each of the subdivided streams is thus constantly changed in respect to the direction pursued by the products of combustion.

The heated solution flows into a vessel, J, having a perforated bottom, and through the latter into a vessel below, whence it flows into a pipe, K, from which it may be discharged into any one or more of a series of concentrating-pans, M, and from the latter the concentrated solution may be discharged onto the bed of a calcining-furnace, which supports the pans.

It should be understood, however, that the concentrating-pans and calcinin g-furnace constituteno part of my present invention, and that they are shown in the drawing and referred to in the specification merely for the purpose of fully explaining my improvement.

I am aware that a system of tubes connected to hollow end plates adapted to be rotated is not new. This, therefore, I do not desire to claim separately; but Y I claim as my invention The within-described heating and evaporating apparatus, consisting of a furnace and a heater adapted to be rotated within the furnace, the said heater, through which the solution is caused to pass, being composed of a system of tubes, 6, hollow end plates, and trunnions, all substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARTIN NIXON.

Witnesses:

HERMANN MOESSNER, HARRY SMITH. 

